This is one of the most consistently updated projects I've seen in a bit and honestly it seems really promising, one thing I do feel like you should add though is maybe permanent upgrades that carry over run from run whenever this game gets big enough. Idk just an idea, but otherwise, keep up the good work.
I feel you. Passives in a skill tree, for example, would be cool! I'll need to think and plan a lot before that happens, mostly because it would be difficult to code. However, the spellbook with a bunch of different upgrade options will be up not too far into the future.
Thank you for your comment <3