I occasionally have a game that suddenly won't launch. You can try verifying the files.
Usually I have to restart, even if I just powered up the SD. Sometimes launching another game (like some simple platformer) then exiting and starting up the game will work.
I wish there were some easier way to see logs or output from failed launches.
This is my childhood! That and Logo Writer were the gateway to my future.
I worked with a buddy; one of us would read from the code listing in the magazine and the other would type. We didn't know the names of some of the symbols so we made up our own names. Tilde will always be the 'squiggly' to me.