Couldn't get past the menu - buttons seem to do the wrong thing and I couldn't "New game" and ended up choosing "Continue" just to get somewhere, and the screen turned into a mess of polygons and locked up.
Thank you for telling me! Looks like hitting Continue when not having a save is causing an issue. I'll fix it in a few hours! If you hit "NEW GAME" it'll work normally.
As for the buttons not working on the title menu - make sure your mouse isn't on top of CONTINUE on the title screen. That'll prevent you from using arrow keys/controller joystick. Alternatively, you can navigate the title menu with the mouse.
When you hit NEW GAME it'll ask if you want to use Mouse Controls (or you can change it in OPTIONS).
If that's not it, I am unsure what's going on.
(Edit: CONTINUE GAME when having no save now works)
Continue works :)
Actually the problem with "New game" is the popup after - "No" or "Yes" both don't do anything.
Also this is one of my personal gripes with modern retro games, curious to hear your thoughts - I notice your main character has 8 way directional movement, and yet the d-pad does nothing, you can only control them with the thumbstick. Do you plan on supporting the d-pad?