Nibbler
Just give it a try. Controls are not perfect but it is a fun fast paced game.
Nibbler is a great game, one of my favorites. Whats wrong with the controls?
I guess the controls are as good as they could be. It just seems like sometimes you hit a wall and it decides which way to turn for you. Could just be that I did not spend enough time with it.
I just started playing Nibbler a few nights ago and it's very addictive.
The trick to the controls (if you want to call it a trick) is that Nibbler will automatically choose a direction if he bumps into a corner. If he bumps into a flat surface, he'll stay put and give you a moment to plan your next move. Mastering this is absolutely critical if you want to survive beyond wave 10.
To illustrate (arrow is Nibbler):
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In this situation, Nibbler will automatically turn downwards and keep moving.
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In this situation, Nibbler will sit as shown until you move him.
EDIT: I'll also add that a 4-way joystick really really helps in this game. I tried with an 8-way and found it unplayable.