Nice implementation. Took me a moment to realize the cards were also health (I think?) and that I was losing abilities as it was going on. I also feel like I stopped getting new drops even as more enemies were appearing, so then I would just get stuck with 2 cards. All said, nice work.
Edit: High score counter was a nice touch too, motivating to replay
Ah well, it is often the case that true randomness doesn’t feel actually random to us mere humans. If it were me, I’d probably do something like pre-calculate the number of enemies to be killed before the next one is dropped, and tie it to that counter, rather than rely on true randomness at any given %. This way, you can control the extremity of the range (and more easily tune early vs late stage behaviors).
