TI BASIC built into the TI-99/4A console is slow. Really slow. This lack of speed hampers a lot of good game development for console BASIC. Not impossible, mind you. Many game makers working in TI BASIC have found ways to work with the lack of speed while still maintaining a functional game. As well, players generally get used to knowing they have to hold a key down or joystick in the direction until the magical moment the program is able to run the detection.
For my purposes, I