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Hey, thanks a ton for your comment!
1. Yeah, if I ever make one with longer levels it would definetly need checkpoints
2/3. And yes, the coins in this game are completely pointless and unrewarding :D. There definetly needs to be a reward or score to keep track of and reward the player for collecting them, otherwise why should anyone care about the coins.
Another person also pointed out how oddly placed some coins are. This made me realize that not only the reward for coins is important but also the placement. In most games they're very delibaretly placed to guide the player and reward them for alternate paths or diffifcult jumps.
I will definitely take this feedback to heart for my future games, and again thank you!