Went ahead and gave it a try, here's a video of said try if you want to watch. Skip to 35:25 for Upgrade Arena.
Thanks for the feedback! Yes, the game is still a concept or idea, and I have some more things panned. But those will come in future weeks, because my computer is broken. I will add a crosshair, global leaderboard, easier upgrading, better AI, and even possibly multiplayer. And also some more quality of life changes, and more weapons. If you have any other suggestions, let me know.