Thanks, glad you liked our game.
For some browsers and OS, there was a bug in the mouse lock extension we used that made it wonky at times, it was fixed a few days ago, but affects the game jam release until we can make the official update to it.
Gradius is a game from our childhood and a definite inspiration along with master pieces like Xenon Mega Blast and Raptor Call of the Shadows.
Just wait till you see what we've made the game during the judging period, it's gotten quite a big additions to it and will be made as a full fledged game with multiple worlds to wage havoc in.