Hi fellow Atari 2600 developer! I saw you game Mutatis, it's very cool and original!
Feel free to ask if you have any question about my game source code. For the "text stretch" effect, it's actually very simple. I first set up the text using the playfield, and then I animate it by modifiying the "FracInc" (Fractional Increment) variable that governs how "long" each "playfield row" appears onscreen. More information about this topic here; https://www.randomterrain.com/atari-2600-memories-batari-basic-commands.html#dpc...