Thanks for playing, and apologies for the late response!
I took a look at all the bugs you mentioned and hopefully they should all be fixed now; thank you very much for the feedback! If you happen to try the game again, please let me know if you come across any other bugs.
For skill acquisition, it's actually based off the number of times you've defeated an enemy, but looking back at it again, the number is a high so I've adjusted the numbers a little.
I don't think I'll add in any content updates to this game unfortunately, but I'll definitely try to update the game to fix bugs.