Very cool!
Having just played Gateway II earlier today, I had to go and see what number 1 was like. Let me just say, the puzzles in this first game are much, much easier than the puzzles in the sequel. Gateway took me about 15, maybe 20 minutes to beat (compared with Gateway II, which took substantially longer).
I am pleased to see that the excellent engine, crisp graphics, and generally slick production of Gateway II are borrowed from its predecessor. Though this one feels much more trivial by virtue of the lack of plot, the gameplay holds up nicely. Good job, sir.