Sorry to hear it froze on you, the web version seems to be a bit of a mess, except the bit part (so it's not your laptop). The main issue seems to be the memory: The C++/SDL to HTML5 compiler I used doesn't really handle dynamic memory all that well, so I went with the more performant name-your-upper-memory-limit-at-compile-time option. I felt nothing could go wrong as long as I set the memory limit high enough. By now, I have already replaced it with a dynamic memory allocation version, which runs even more laggy, but should no longer freeze. Once again, really sorry ;_;
The input stuff is weird, because it only happens on itch. I'll probably have to fix this at some later time since I really have no clue what's going on there.
Glad you managed to have a little fun with it though and thanks for the feedback!