Hey thanks for playing it! I agree that it is a little too "slidey". Thanks for giving it enough of a shot to realize the Platinum Games/Beat-Em-Up/Brawler vibe I was inadequately shooting for.
There are in fact 26 different combo levels. I kind of messed up by having the win condition trigger when you defeat 30 enemies. You might be able to see all of the combo levels if you use the buildings to chain the combos together but I haven't tested that yet.