Super impressive for a 2-day solo dev project! I like that the character can collect coins by shooting them, it was fun to snag coins that way during combat/exploration. Also, having an options menu and a high score system are extra bits of polish that go a long way, so kudos to you for that. I'll be honest, I wasn't really sure how to use the building blocks effectively. Hoarding them made me a big slow target, and placing them down didn't seem to stop the enemies' movement. Maybe I'm missing something there, but I ended up ignoring them altogether on my last run. Still, I had a good time running and gunning while exploring your Atari 2600-esque alien landscape. Great work all around- I'm excited to see what you make next!