This game is really buggy and I LOVE IT... but... it does make games go by super fast. I'm able to get a TOD from water from almost anywhere on the stage, not because it's infinite, just because the HP is super low. I think you didn't expect people to combo, which is weird because it's very easy to combo in this game, so you made the HP low in hopes that the game wouldn't be boring, but it just makes none of the games matter because their over too quick. Spamming air's attack into down + attack literally removes half your healthbar.
But moving from the land of game design into cool ideas I wonder if it would be cool to have a character select screen where you could choose to be a single element and then make one of the classes the "Avatar" which works like it currently does. I think this could make more centralized tech with each elements strong suits and make it so their cool same element synergies could still be triggered if you wanted to by picking the Avatar. I also think that with such a small amount of elements if you could make inter element synergy, like making air move fire around, or water's wave moving earth's rocks around to make it so choosing the element with your strongsuits worth it rather than making you just want to pick the same element to counter their effects. Just suggestions!
(P.S. Don't fix the bugs, crouch canceling has become my favorite thing to do in this game)