Incredibly difficult, did manage to see the boss once on a lucky attempt with a lot of "ceiling shooters" spawning.
Enemies have friendly fire it seems? Kinda makes them blow each-other up when you have a mine explode xd.
BGM track is nice, doesn't feel repetitive much after playing a lil' while.
Also think the space ships are nice looking and overall the game would fit on a gameboy, but do think you went over the color limit?
Good to see all is <div/> ! Oh! does that mean I need to exploit it?
1) Open console & click the script that shows the "Event started" lines
2) Right click it to override.
3) ctrl + f this : "this.playerState.lives" and comment out the line below.
4) Profit, you are now immortal. ⭐
Overall nicely done! Sure we'll chat more about it on Discord. :P