Yeah, Danger Course basically came out of me want to try to throw together something quick as I was getting frustrated with how long it was taking me to finish a different project. It didn't end up panning out that way (it ended up taking about four times as long as I was expecting), but I basically did the initial game design working around assets I already had - so the running sprites from this (though the new June sprite aside, Alys is actually 1 pixel shorter in DC, not that you'd notice on the PD), the mines are from Sight Blight, the fire is from... well, something I've not actually released yet, but it was something I already had lying around.
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Ah yeah, I'd noticed in Danger Course about the heights, that Julia and Betty were noticeably taller than Clarice and Alys. June also looked taller, but it might've just been the pigtails.
It's good that you've been able to reuse assets though. Makes it easier on you, and gives your games your own signature. 🙂