Oof, sad that you weren't able to beat the boss! I tried to make it challenging and fun, so that a few attempts should be enough to learn mechanics and clear the game. I see how the game could be a little easier (the time limit on some rooms is pretty tight too).
One of my (scrapped) ideas was to make an easy/normal/hard version but I was too lazy, oops. I do have a true ending and secret ending for this version but had an idea for other alternative endings. With all the mistakes I made, and all the ideas I could have added, I definitely have a lot to learn about game dev!
Glad that you enjoyed the power up system and the cutscenes!