>>9589834It's sad but virtual pets made by anyone other than bandai are extremely poorly documented. There is no general virtual pet wiki, and even GigaPets, which was a brand that was on par with Tamagotchi in the 90's, doesn't even have it's entire list of releases on their own wikipedia page.
The best you can do is look into websites that were into the virtual pet craze of the 90's and stopped being updated in 2003 and they're usually designed like shit where you have to dredge through pages instead of searching, and they still don't have everything. Shit sucks.
Anyway the closest thing I can think of based on your description i'm going to say it's Eggy, AKA Cute pet, AKA CyberBaby, AKA comet critter.