Thank you for playing!
Regarding your points:
1) I think what you're experiencing here is just that the player character's movement speed is 1.25 pixels per frame. The game display is pixel perfect so there's nothing that can really be fixed here.
2&3) I don't have any plans for an update for this game currently, but if I do I'll consider adding controller support + an alternate font.
4&5) All intentional! I think it's cool to have unintuitive strategies like that. Playing around the more unreliable or specialized abilities offered is part of the fun too.
6) Music changes happen at the end of the tracks' loops to keep the audio continuous, so while the main trigger is every 15 minutes, they won't necessarily 100% line up, especially if you pause the game.