Just had a quick try. Here are my first thoughts.
I played it through twice, the first attempt ending quite quickly as I fell off the table. Which I imagine is one of the game-play aspects (avoiding the edge which makes sense and makes it much harder than it would be otherwise). The second go I kept my eye on the edge (although again I ended up falling off at the end, my health was pretty low by then though)
I see what Phaelax meant. It is going to appeal to some and less to others I imagine. I'm not the biggest run and gun shooter fan myself so can easily lose interest in these types of games. However, it isn't as bad as all that and is nice and smooth on my system as well, so not game-play issues in that department. The table edge thing kept me going though and curiosity about top scores. I would not be able to match the top ones as they are way higher than my second attempt.
Perhaps some rest time in-between levels? I saw a Devil like sausage at one point and the spawns stopped until he was dead, so I am guessing that's a level thing
Maybe make that a little clearer with a big message or something? Some sort of breather space would be a good idea there as I found I was ready to stop at that point :p Too much shooting!
I picked up any upgrades I spotted if I could and found health, bonuses and speed ups, but not upgrades to the gun? I wasn't sure what the petrol like object did though and it spawned a lot. Not sure here, I may just have missed it. Giving the player rewards every so often helps keep em interested, so may be some different gun effect every so often?
Also, not sure if this is a stamina thing or something but sometimes SHIFT let me run, other times it seemed not to. It could of been me pressing the wrong button and not noticing, but I think it was intended. You would know ;p
I like the fact you added in some differing attack patterns. More of that will help keep it interesting.
Hope that helps you out a bit. To summarise I would make it clearer when you complete a level or wave. I would perhaps make the earlier waves a little less daunting to start with as I took ages to see the devil sausage or it seemed so shooting away like mad! I may have missed mini waves or such, but it reinforces the need to make it more obvious
more obvious power-ups or bonuses to keep the player happy and rewarded. Some way of taking a bit of a breather along the way, it can get a bit intense when it is busy! Variety is always good so more varieties of sausage would be useful with slightly different attack patterns. You may even want to change the table every so often (unless you do and I wasn't able to get there) Maybe some traps you can lure the sausages into, sausage trap forks etc.
Not a bad effort at all, simple, yet way better than many attempts at games in GG so far. Smooth and fast. Auto fire ( mercifully ) and an online high score always helps! I added one manually in AGK ages ago in Moonsnaker (still on Google Play) but had to shut the server down that hosted it. A shame, but had to be done (took me ages to get it to work in the first place as I am not massively knowledgeable about sql and php.
If I had released it I wouldn't think it set the world alight, but I wouldn't be ashamed of it either, I'd just be chuffed I'd finally got my bottom in gear and made something worth putting out there!
Edit - Yeah those ideas above sound good as well
I was trying to keep the ideas simple for now and therefore a lot easier to add ;p I mean a Monster Sausage would be good as well at some point no pun intended
SPECS: Ryzen 1700 CPU. Nvidia 970GTX. 16 Gig Memory. Win 10.