I bought the DE-10 Nano back in 2020 for around $130 I believe, then slowly bought the expansion boards, 8bitdo joypads / arcade stick and metal case, couldn't be happier with it.
Even though remaster was free for Q2 on Steam, I'm going to buy this for the second time - for Switch. Nightdive is such a great dev, I want to support them. I had a blast with Turok 1&2, Doom64, Shadow man, Q1 and System Shock. Wish they released Blood on Switch though...
Good news! The remaster is indeed free if you had Q2 purchased, I just looked at my library and I have it. Man, Q1 remaster was balls, this will be super fun for sure as well.
No, there are three games, the game you posted was actually also on PS1 (and Saturn and PC and 3DO).
Fourth Gex game was planned and supposedly it was converted into Whiplash on PS2.