recently got a Steam Deck and noticed nothing was there, I was hoping this could be added.

When I play the game in fullscreen, it has a bright blue letterbox border on top and bottom. It's pretty distracting as opposed to a black letterbox. Is there any way to fix this?

Game is closing soon as I press Play in steam

...no keyboard remapping. For some reason i still dont know, game devs still think 2D games are better played with a controller.

You lose the fruits collected since your last checkpoint as usual when you die, but the fruits won’t respawn like they normally do after dying, so it’ll likely become impossible to get the gem for 220 fruits if you die so you’ll have to restart the entire level. On a side note I often get respawned like way back if I fall into spikes or lava, idk if this is also a bug but if this is intended it’s kinda ridiculous to respawn the player that far back. It’s still a good game tho...