Really well done!
Great interpretation of the theme, and the sound effects were really good as well!
Wished I knew exactly what "Danger level" meant and that it saved progress between levels xD
Was kinda just building it up as a highscore on the first level, I got to like 900-ish until I realized I had to shoot the hole thingy for the boss monster lol xD
Played until the end, it was really fun!