I really like the welcome screen! It's simple put it works really well! The idea is also super nice, having different abilities is interesting way to change the difficulty.
Visually, I think the game was lacking a little something. When I play Snake, I like to see the maze that gets created when I move around, but the size of the segments of your Snake made it impossible to see, it just became a big square of color.
There was a little bug where the apple would spawn in a part of the Snake, picking it up instantly. It's not bad, but you might want to have something check the collisions so it doesn't happen.
Also, the Fighter is completely broken :P I just did the double score ability over and over and I got a score of like 2 millions points!
