Thanks to you (and your son!) for checking out my game. I'll sort that bug out now. Weird all the things you miss when you're testing your own game, huh?
I'm using Spriter for the animations in the game. Spriter has an absolutely fantastic plugin for Construct 3 that does a lot more stuff than I need, but it's impressive how much work they've put into it.
You can do some cool stuff with Spriter but I like it because it saves time. Rather than drawing loads of 'frames' you just make some body parts and tween the movement. It also gives you hundreds of frames of movement with very little spritesheet size.
If anyone wants my spriter animations to use in their own work, or mess around with them, feel free to download them here scaryhamster.com/games/SpriterAnimations.zip
I'm not the best animator but I like using spriter. :)
Thanks again for playing the game. :)))