Ok well here's a list:
- I can't get the game to work with a controller at all, whether using a DirectInput or an XInput controller.
- Controlling the game with the arrow keys works in the menu, but not in the game. There I can use only WASD to move my character around. The Shift key fires as advertised but PageDn does nothing, I have to press Enter to fire my secondary weapon. In addition to that, pressing the arrow keys or PageUp/PageDn still controls the scrolling for the browser window even after clicking the game's region so even if they worked, it would make the gameplay unbearable.
- When pressing Enter on the "pause" icon on the sound menu to go back to the main menu, the game seemingly registers another Enter press right after, which sends me back to the sound menu unless I quickly move the cursor and select the play option on the main menu, which starts up the game normally.
- During gameplay, the scrolling of the screen is very choppy and the screen seems to scroll in "chunks" like an old Konami MSX game. The game also seemingly has to stop and load everytime it generates a new level section, which wouldn't be so bad if the load times weren't so long... There's also a very long load time when selecting the sound menu from the main menu.
- Sometimes during in-game loading, my character will warp to a seemingly arbitrary position on-screen. Once I got stuck on the left edge of the screen and couldn't move. I had to wait for the enemies to kill me.
- Holding down right seemingly makes you go past wherever the enemies are spawning which basically makes you invincible as the screen tries to catch up to you.
- Firing the secondary weapon also makes the little rotating pod fire missiles regardless of my ammo count. Speaking of which, I don't know if it's supposed to be following me, but it's only ever staying in the corner of the screen.
- Pressing M or N or possibly other keys bring me to a hidden options menu which has an option for fullscreen mode which really helps, as well as other option which don't seem to do anything. One of them doesn't even work when I click it with the mouse.
- The third option on the main menu does nothing. Usually "quit" options in browser games would simply freeze the game region, but here nothing happens.
- I don't know if it's a bug but the game itself has no music, which is weird considering both the main menu and the secret option menu both have music.
I was playing on the latest version of Firefox, if that helps.