Thank you everyone for your feedback already! Not sure if there's a way to multi-quote, but I voted up your posts, just in case that sends out notification.
- crash related to the fireball enemy is fixed in the latest update
- scores will be saved and there will be some kind of progression eventually
- when I'll have enough bosses and enemy cards, I'll be able to create a separate game mode which will have an end
- art is going to be the last thing to be reworked, maybe after I'll feel like I have a well rounded game already