Thank you very much for trying my game and leaving some feedback!
Definitely, this is meant to be more a foundation than anything else. I really want to continue this game after the jam is completely over and make it a much more complete and refined experience.
For the i-frames, yeah, I definitely need to adjust that. Both the actual balance and the code behind the scenes. Especially with the sort of interactions and attack patterns I want enemies to have.
And thank you about the comment for the art. I'm primarily an illustrator and don't have as much experience with pixel art but I'm glad people are still liking it.