'tis fun and pretty. Movement feels pretty good too and I appreciate the squashing of bugs. However I didn't quite understand how to upgrade / level up things, maybe the UI isn't finished yet.
Viewing post in Archtower jam comments
If you have atleast 3rd level you can upgrade your skills, for that you need to open skills window (press U), there you can check skills and choose available upgrades, hover over to check descriptions, perk points cost and level requirements, then if you see those nodes in blue color just click on them. Don't use npc in the camp for upgrades, it's obsolete, but he can still let you respec for coins.