I can't start the game. I select the level "the cave", it shows the intro and then I can't do anything. Am I missing something?

Maybe in the near future, perhaps?

How you suppose to get passed the dog? Was enjoying the game till I got to him. Jumping mechanic is awful as it is. Not fun when you have to keep going back to fill up with diamonds because your shooting bullets dont restart on this level if you die? Also you cant continue on this level if you die. Why would you make it this tedious? The bullets half the time dont even register on the dog. Better balance needed. Went from an enjoyable platform to a trolling experience in just one level....

Anyone has a helpful tip or anything regarding to those? I struggle heavily as both the playable character's hitbox and those of traps' are much bigger than the sprite of it and as the platforms / traps are too reliant on perfect landing / sliding below and above off of them...

While I get this is a budget game, the big problem is that all too often the game feels like a "hold direction key" simulator, with those looooooong hallways with nothing to pose a challenge once the enemies are gone. A quick fix to that would be a run button, so normal speed is kept for precision platforming parts, but the longer elements can be easily skipped....