The game is fun but without a jump button there are pellets you can´t collect because you´d be stuck between two enemies or between an enemy and a wall.
So I would also suggest a jump button or a limited amount of uses of temporary "invisibility" or "invincibility" against 1 enemy per level.
Also sometimes frozen enemies do affect the game when they are frozen upon a pellet before / above the only hole to go downwards.
Then you can only choose "death" doing the level anew hoping that the enemy won´t get frozen at the same place again.