I wrote a bunch of these game prototypes in the mid-90s. Here's a sample of the protoypes I made. To get these videos, I ran virtual machine to emulate DOS or Windows 95 in order to get these to run. Of course they won't run on a modern PC directly anymore.
I wrote this sprite in QBasic for DOS by drawing pixel locations. I used pixel screen colours to detect collusions with the ellipse. Pretty amazing what one can do with primitive tools.