The visuals are quite fine and the controls are okay. I just feel like you should have used a keyboard input to shoot and not the mouse. Shooting with the mouse when you don't target with the mouse at all just feels weird.
The sound effects feel like they are interrupting themselves which deosn't sound good, and is not satisfying.
In my opinion, the big downside of this game is its clarity and its weird choices for the UI:
- Having to select the difficulty after clicking on "Random difficulty" is weird. It would have been better to display the difficulty and having an "OK" button.
- You can't really know when you got hit because you have no audio or visual feedback besides a number in a corner going down (which is not enough).
- The big enemies should have had a sound effect for when they get hit (and not only the small enemies).
- Having the enemies disappear a bit after they are killed (and not instantly when they are killed) is confusing.
- Then, there are many issues with the '?' circles.
- They don't really feel like power-ups. I thought they were a trap or something at first. You could have animated them a little bit or could have added some kind of glow to show that they have a positive effect.
- When you touch a '?' circle, it just feels like the game froze. That is probably because you don't have a sound effect nor a good visual hint to tell the player that they need to do something.
- The menu itself is quite confusing. I felt like I had to choose an option among the 4 but instead there was only one option which I was supposed to click on. If you really wanted the player to know all the available upgrades while getting only one, you could have made a little animation cycling over all the options and stopping over one of them.
- Being able to pick up a '?' circle several times in a row does not feel normal. I guess this is a bug though.
Also, that is fully subjective, but I don't feel like the game fits the theme well enough. Replacing the square enemies with dice or simply showing a dice roll for some of the randomness could have helped with that part.