Hi, thanks for trying my game!
I'm not sure about having a boss at the end of every map, but there will probably be several bosses as you go up the levels, eventually! I'm making it up as I go so who knows what it'll eventually end up like. My big inspiration is Nuclear Throne so maybe something like that if it works but I'll have to experiment.
For what I'm doing in the short term; I just finished implementing a new weapon and a new enemy, and I'll be focusing on refining the gameplay a bit more and squashing bugs and problems before I release the new update. The update after that will probably be focused on improving the environment and maybe adding a new level but that might get pushed back depending on what kind of feedback I get and what bugs turn up.
If you have any suggestions or issues, please let me know! Much appreciated!