The game is very nice, well-made in many ways. The only flaws that made me drop the game after the first level are the following:
- The waiting time in the dark is too long. It should be equal to the average time it takes you to travel the route to the furthest point you can see with sonar. For example, if you wait 5 seconds in the dark, then you should take a maximum of 5 seconds to reach the furthest memorized position. Otherwise, those with a good memory are penalized anyway.
- There are collectibles along the route (maybe there were some later, I don't know), but I would add them right away!
The idea is very nice, and the sound and graphics are also well done. Congratulations, it's a good foundation.