Jared Devs, ありがとうございます！No, seriously, thank you so much for commenting! I put some extra work on the factors that scaled well, such as upgrade systems, boss combinations and "kill fast or die fast" style of gameplay. The reason for making it scale well is because I plan to keep working on it, to bring this game project to fruition in the future. Or at least, learn more about how to make an interesting roguelike. It needs balancing and more variety of powerups and bosses (such as WHOLE SCREEN bosses, or bigger ones).
I appreciate it, thank you again!