As the others already pointed out the title screen absolutely has to be skippable. Especially since your game is quite difficult, and while dying a lot to a game can work the title breaks the flow a lot. I love the 8-bit look and feel of the game (I don't know if intentional or not but i think the difficulty also fits quite well with other NES games). I have one bug to point out and that is that when enemies try to pathfind to the player, and end up hitting a wall, they get stuck forever. If you were to fix these, and maybe make the frog ninja just slower, instead of coming to a dead stop when using the sword i think you might have a great retro style game on your hands. The problems do sadly kinda kill the experience a bit tho.