The concept of this game is really awesome, I also enjoyed playing this game. There are a few points in this game that break the feel, so, you can consider polishing it up to make this game super interesting and professional. The tank seems to move on air away from the ground sometimes, this looks really odd and as a player, I assume that the game has broken. The game could have been fast-paced or else at least the bullet should have more velocity than the current one to make it feel impactful. Then the game progression should be increasing linearly to make the player acquainted with the game environment and adapt it to play more difficult levels ahead.
But apart from all these things, it's a good game to play. Will be looking forward to more such awesome games like this.