Neat concept! I like how the game is very easy and the only one who can make it difficult is yourself, this is a very good mechanic!
Some suggestions if you plan on expanding the game:
- I noticed some visual gaps for the tilemap you are using for the level: to fix this, simply go to your grid object which contains the tilemap and make the cell size's x and y components something like 1.001 instead of 1, this should eliminate the gaps in between your tiles;
- I would suggest to make bullets faster, not make them bounce on walls and also make the hitbox of the target larger, which would make it easier for the player to kill the target;
- The concept for the game is nice, but I think you should make it clearer when you are hit by one of your own bullets: it took me some attempts before realizing why I was dying, since it's hard to see bullets that are that small, so sometimes I just find myself dying and not really knowing why.
- Sometimes, no matter what I do, I can't find the target: the very short time to find it makes it so that whether you'll find the target or not is based on pure luck, hence if you randomly choose a position at the start of the game and the target is in the opposite part of the map, then you're sure you won't find it for that round, which is somewhat of a shame... Maybe try making the map smaller, or the field of view of the main character a bit larger.
Ultimately, I would suggest to continue working on this to turn it into a proper roguelike: after polishing the game a bit, you could think about adding powerups for the player in between runs (for example, move faster, increase your field of view so you find the target faster, increase the damage of your bullets, so that maybe at start it takes 3 hits to kill the target, but then you can upgrade your gun to kill it in 2, then only 1 maybe, and similar powerups/upgrades).
As I said, the concept is great, I hope you'll "expand" it (if you know what I mean). Good job!