Critiques (Some pointers in case you guys want to make a more complete game[I also included some that I saw from other's comments])
Sound Effets:
The bullet sounds is too loud/not as satisfying because it hurts my ears. It feels like it peaks a lot especially in the higher frequencies.
The mixing of the sounds is not as good basically. Some sounds are too loud some sounds are too soft [getting hit]. There are times where I do not notice I got hit because it is difficult to sense it.
Visuals:
1. The level design visuals is alright but at the tutorial level theres a lot of introduction to the assets which you will be using. Then at the actual level it shows that the main stage is just a wooden platform with fences around it where the introduced assets are located. I think this is a missed opportunity because you guys could have done a more creative level design to show the setting.
2. The game might need indication for attack, zone of attack or where they will attack. At some runs, I am getting hit by the boss because I underestimated the boss's attack range. (at least for the jump attack of the boss, for the others not so much because It can become a huge visual clutter if the normal mobs have them)
3. (Nitpick) The bullet changing its size when they initially spawn is kind of weird for me. Because to me when a bullet changes size, it also indicates a change in stats such as speed and/or damage.
Gameplay/Feel:
1. The chain reaction of the enemies is very very satisfying. But if you will be developing this game even further with higher enemy densities, it can get very OP quickly.
2. Enemy placement feels just right because some don't die in a single chain, so there is still some kind of puzzle solving involve where you manipulate the ones following you to die in a specific place.
3. I am having troubles when I combo because of the lag. I am not sure if its only on my side but it does give a bit of frustration because in situations I might get hit by the bullets especially during the boss fight. Basically, the lag takes you off the "state of play".
4. As a player who has played a lot games with reloading, I have the itch to reload before the next level. Having no manual reload is quite troublesome.
5. For the feel of the shotgun, it doesn't feel as satisfying. Although it does have a higher damage because of the number of bullets, when I stand close to the enemies I expected that it will essentially kill 1 full health mob. If this is too OP, maybe add a different property like some kind of knockback when you shoot.
6. Your movements are very limited. And to escape, you need to kill the group of mobs to gain space.
Personal Opinion:
I personally had a lot of fun playing this even with the problems I have encountered. For a gamejam with the time constraints, I think this game is solid but still needs quite some work especially in the map design.