Saw the  newest video and had some suggestions 

1. Instead of generic car enemies make a Clown biome where the cars are clown themed and when you defeat them a few clown enemies pop out of it 

2. If you still want roaming vehicles as enemies and potential mounts later you could make them be motorcycles ( or I guess monstercycles ) bikes that have googly eyes, squiggles or whatever coming out of them, not just generic looking motorcycles. This also fits the theme you mentioned in the video about cars being like wild horses since motorcycles as often referred to IRL as Steel Horses  :)

3. The inventory menu could be snazzled up a bit. Have the items floating in liquid ( I mean the game is juice themed after all ) and maybe have icons for the hands and head where things can be equipped to. Instead of fighting with the current menu you can just drag the item from the juice jar theyre floating in and onto the hand you want it equipped to, or the head. Just make sure the menu pauses the game so the player doesnt get attacked while going through items 

4, I think in the video you mentioned removing the Bubble biome? I hope this isnt true, that place and characters were really cool!

5. Do not waste dev time with extra game modes right now, especially the online leaderboard things. Wait till the game is near finished before messing with all that. Id even go as far as to say dont bother with leader boards at all. Online aspect is a whole can of worms to implement and will be a massive time sink with little to no real benefit to the game as a whole. People that want it will set their own rules for speedruns and do it anyway without the need of implementation, look at older n64 games as an example