There is a permanent speed upgrade available, but it can be a little dangerous as it makes the later levels in narrow corridors much more difficult. I'm trying a build right now with smaller maps and a 20% faster base movement speed though, and it's hectic but I think more fun.

Thanks for your feedback! I'm testing a follow-up build now with a smaller map and it actually does seem more fun, as it avoids a lot of the frustration and tedium of getting lost looking around the maze.

That's an interesting idea. One thing that's not documented in-game is that when your snake is small, you get more food respawns. It would be interesting to try changing the pacing so that you need to eat food more frequently or decay even more rapidly, I would just have to be very careful about not allowing the RNG to punish the player with a food desert they can't get out of. Thanks for playing!

Level 7 is not bad at all!The difficulty ramps up quite quickly after 5. Thanks for playing!