Glad to see a fellow Vampire Survivors enjoyer lol, I can see we had some similar ideas for our games :]
I've had some other people tell me the same thing about the levelup menu, I'll probably make it come up a little slower so it's not as easy to click one accidentally. Also, in regards to the movespeed upgrades, it was working but the amount it increased by was so small that the result wasn't noticeable. I buffed it substantially in more recent versions so it should be a better levelup investment now lol.
Thanks for playing & thanks for the feedback! :)