I'm thrilled to hear the title screen was a hit for you. For simple games like this with unusual movement, I think the title screen is a great opportunity to teach the player, integrating a tutorial in a clean, non-obvious way. I did something similar in my entry last year, but this time the game is simple enough for the title screen to really teach you everything you need to know. I did have a brief thought of disabling death there, but kept it because it's funny, teaches a lesson, and helps show off the really cool sprite-0-hit collision.
Thanks for the kind words about the controls, and I appreciate the feedback about a pause feature. I discuss both in my reply to Matthew Justice further down the page, if you're interested. As for collision, I touched on it above, but I used sprite 0 hit for it and I think it turned out fantastic; it's hard to think of a better use case. Sprite 0 hit has so many limitations that make it a bad tool for object collision and I'm really fortunate it works so well for this game. Having to replicate this in software would be a serious challenge, and less precise collision would really hurt the game's feel. Dodging an obstacle simply by rotating the ship feels great!