Wow, thanks a lot for your feedback, it's really helpful!
About the bosses, I intended them to walk but other problems have led me to just do a reskin, I'm going to make some updates to fix that after the jam, just to have something better if someone find the game again.
Maybe the lag issues would be fixed if I didn't generate the map endlessly, as I said in other comment... I'll take note about that for my next games and pay more attention to optmization!
About the attack area of the bosses, I should have add some effects while it was growning to make clear that the area do damage (and add an effect to the player when you take damage) or damage the player only when the area reach the end. (Just saying this to remember myself when I update the game xD)
I'll fix the audio too, I don't usually play with audio as I dislike it a lot (I know how important it is for feedback and all, but sometimes I need to play while in absolute silence, so I just never thought about volume control, just on and off. Thanks a lot for this advice!
The assets reloading happens in every build ( at least I had this problem everytime), I need to work more in this system to understand better what is happening and optimize it! Thanks for letting me know! :) (And I should have add the bosses to the main scene and only load/unload when their home map is out of view... But the stress didn't help me remember to fix those things hahaha