Well I've finally done it!
I had already customized the matching game from kittiewan to make a phonics game for kids but I've now (mostly) finished my very first game from scratch.
I was going to put it up on the arcade but though I'd post it here first so that I could get suggestions on how to improve it.
It's a basic little math game for young children, primarily made just for my own students but I'm happy to share with anyone who thinks it will be helpful.
Please have a look.
Also here is my .capx file.
If anyone has time to look through it and suggest way to make it work better that would be great as there are some buggy actions and I'm sure my code is a little scrambled.
Looking forward to feedback!