Thanks so much! I'm glad you've been enjoying it, I really appreciate hearing that!
This game was made on a super tight-deadline (and almost missed the submission period to the game jam due to an extended power outage....) so it only has 2 main endings, a good end and a bad end. Spoilers below, in case you haven't found both....
Turn back now if you don't want spoilers.....
Ok, you've been warned. I won't spoil the story element though, however small it is...
The bad end is reached if you are defeated and continue during your playthrough. The good end is achieved by doing a no-defeat playthrough. In hindsight, I don't know how fair/nice this mechanic is, but it does serve a purpose story-wise.
There isn't a HUGE difference between the two endings... most of it is the same, but the bad ending has a stinger at the very end, and the good end has a final happy ending art card.