Nice job! I was sucked in by the drive to get better at the mechanics. It did feel somewhat inconsistent when the boxes exploded and when they didn't. I could have been doing it wrong though. By the end I was running around dodging things, watching my health (and picking up more when low), and scooping up points where I could. Overall it was good. It was hindered by my confusion of the mechanics. I like the idea of the objects having so many uses. They were ammo, powerups, and enemy ammo all at once. Very cool idea.
Edit: I reached the end with a negative score because I died so much, but I just ran around afterward and grabbed more points for fun, so i technically closed the game with a non-negative score.
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Thanks for playing.
You probably did everything right, just because of the lack of time, the boxes may not explode sequentially if you throw them hard on another box, and they may also not explode if they have just been spawned. And they also love to explode in their hands, so it's difficult to throw a red box :)