One time the enemy punched me in the start of a match, I parried and the guy was knocked back, I walked up on him like stairs and launched. After that, the guy kept on punching me in the leg and held on, somehow I flipped and it was a pin down.
Speed upgrades would be nice. Otherwise you just buy a ton of stuff, and... that gets a bit boring, and then after you get all those achievements, you can't get faster. Maybe... there's some crazy high amount (50-100, maybe?) which is the maximum amount of speed upgrades for a building. But to prevent a super long menu, why don't you do something like you did with the buildings?
Thanks, HyperHippo!
I think the first cave is too hard for players, because you're a pretty new player when you fight a 2.2K HP spider that shoots toxins that hit you 5 times a second that do 6 damage.