Best of both worlds, oldskool sound and visuals, but modern functionality! Upgrades in particular is just something you don't find in old games, but I like that they're balanced, and unrequiring too much grind to trump up. The artifacts were a fun addition too, like Easter eggs - all with a description to match, and the one that requires a double jump to get to took a few attempts to reach. I like the level is built in layers too, so depending on your current skill you can explore different paths to reach the same goal. It's short and sweet, and just challenging enough. Retru shooters should've all been like this. :D Nice work!
-cd-