I recall bosses getting harder around lv 50-60+. The beginning bosses were easy, yeah. But some of them did not wait long at all between attacks. I recall this lv 69 worm boss for example that wouldn’t stay still and filled the whole screen with poison and traps. It was really hard to maneuver and I died like 4 times 
Then there were bosses that were hard only because of a bug, like “Molich” who had an unavoidable 2k hit attack that instakilled me over and over xD.


