This was really fun! I think it's a bit too easy at this point though, as long as you keep running and you don't get surrounded there was no danger. Even if you get hit, you can just grab some of the healing orbs the previous enemies dropped and get back to full HP instantly (because they don't seem to fade). Also the spear is OP.
If you keep working on this game I think a fun thing to implement is the option of having different builds. Right now it feels like all roads lead to Rome (as in whatever upgrades you get in whichever order doesn't really matter that much because there's only 4 upgrades and they show up periodically anyway). But within the confines of the jam this was really well done!