A pretty solidly crafted April Fool's joke all around.
A-Type does a damn good job recreating the 1989 classic, with the occasional Bob-Omb to spice things up. The cavalcade of NES characters flooding the playfield at seventeen lines caught me by surprise, I'll admit. The ending punchline is also as hilarious as it is dark.
R-Type is a bit of an afterthought - didn't keep me hooked particularly long.
(Sidenote: Using the Tengen version of Tetris in the title screen was pretty clever IMO. Pretty deep cut there.)