I've been learning Z80 ASM since March and made a few basic games (Pong, Snake) as practice, but I've been wanting to start a larger project I can upload to the archives, and I noticed that there aren't many ASM ports of Space Invaders to the greyscale calculators. It seems like a fairly manageable game (famous last words), so I figured I'd give it a shot. In terms of features, I want to add a leaderboard that displays the top 5 scores alongside names, but otherwise I want to keep the game as close as possible to the original, with a goal of finishing before Sept. 1. A screenshot of the title screen is below:

Hope you finish programming it soon! What will the sprites look like?

I made 8x8 sprites for the ship and UFO as well as 3 monsters with 2 frames each, I'm not an artist by any stretch, but they should be enough to get me by.

As for development, things have been progressing at a decent rate. I've finished the "Credits" and "Controls" menu options, and have the ship moving / firing missiles. A clip of what I have so far is below, though the artifacts don't exist on the emulator I'm using.

Nice progress! Sprite movement and bullets look good so far

I once tried doing this in TI-BASIC. It did NOT go well. What is this being programmed in? AXE or raw ASM?

Keep up the good work! By the way, are you using the Ion routines provided by most modern TI-84 Plus shells for your sprites, screen-copying, etc? I notice in the screenshot that you're using MirageOS; it's worth mentioning that Doors CS as a possible alternative, including the HomeRun feature that will let you repeatedly test without entering the shell every time, saving a few keystroke.