I like it, but there's a few things that should probably be fixed. The clock pickups don't scale with your upgrades, and the speed scaling got pretty difficult to control toward the end. The first level was also the hardest by far, needing to miss almost no shots to beat the robot on the right side, but everything was too easy from there. Maybe having bullets scale in cost, or having enemies get stronger depending on how much time you've used. Overall though, fun game, nice work!