If the aim of the game is just to practice stealth then I guess it's an alright game, nice work. The graphics are decent and the player's animation is good. The robots glide but I assume that's because they're on wheels? Maybe, to add a bit more motion to them, make them lean in the direction they're headed. You could add some music to build up the tension when sneaking around or SFX like an alarm when spotted by a robot. I'd say either have less robots or make the map bigger with more corners to hide around or places to seek cover. The robots seem to be inescapable when they find you, some way to outrun or hide from them might be a good feature to add. Making a feature to disable a robot if you successfully sneak up on it would be a good addition to the stealth feature as well as being rewarding for the player. It would also allow the player a brief moment to sneak past the robot undetected. Overall, nice game :)