Gamejams are quite time constrained and there isn't so much time to gather feedback. So now one day after the jam I packed in some fixes and improvements:

-Level 5 red enemies speed resistance corrected

-Speed decrease after killing red level 5 enemy slightly reduced, and gives you a moment of invulnerability afterwards

-You can now return to menu in middle of the game by pressing R

-Added more juice to the menu

-Added high score to the main menu screen as well

-Added controls page to the main menu

-Added warning indicators for ruins to make avoiding them a bit easier

-Removed a few ruins in places where there were multiple very close to each other

I'm looking into possibility of adding online leaderboard for high scores; stay tuned!