Nice game, it looks awesome the sprite work is on point. The main menu and the level pattern all look pretty nice, the game does not control the best but I can see what you're going for it is hard due to the way the jump works which means the player needs to be consistent or die.
The jump is a bit disorienting, but if you work it out a bit and add some level pattern variety, I could see this being a lot more fun. Great start.