Hey there, your game is definitely FUN! I actually never played Bad Toys (or your remake) but I'm a big fan of Wolf3D and its derivatives, especially Blake Stone which this actually reminds me of a little bit. The bins full of parts are just perfect. It looks like you have replaced most (all?) of the assets from BT, which I would recommend going forward as it appears that the original is still for sale on the Tibo website!
I did run into a problematic bug, where the items don't populate correctly in the map. Most importantly the switch to open the first locked door! But also a bunch of decorations and stuff were missing. The first time this happened I thought it was because of the difficulty setting, basically when I restarted the level on medium everything came back leading me to believe they were just not flagged to spawn on hard. However, then I downloaded again on a different computer and picked medium first thing, and the same items were missing. Restarting the mission (again on medium) fixed it, but then I got missing items in the next map too!
Anyway the gameplay itself is pretty solid. At a basic level the gunplay is satisfying which can carry the whole experience. I found the rifle to be less useful than the pistol, which is slightly disappointing for the first new weapon you find. It does seem to do more damage but with the slower fire rate it is underwhelming. Maybe I'm missing something (shoots through enemies?). The enemy behavior could benefit from a little bit more randomness. One of my favorite parts of Wolf3D was when a guard would just bugger off for a while, slamming doors somewhere while you hope you don't get shot in the back suddenly. Patrolling enemies were also one of the things that made the level feel more "alive" and I think both of these behaviors could really work well here.
The framerate was pretty inconsistent, not sure if you can do anything about that in GameMaker... I initially blamed the potato I have at work and then found it almost went too fast on my PC. This isn't game breaking but it was a bit odd because the timing of shots suddenly would get much faster, maybe there is a way to cap the framerate?
I would really like to see the controls more customizable, as I would prefer to use Space to open and LMB to shoot. Also being able to save mid-level would be nice. Some other non-gameplay things, intermission gunshot sound is super loud even if the sound volume is low, and the secret opening sound seemed a little out of place (intentional?). Also the player's hands don't really match the voice? I'm not sure if I'm a toy or a human?
Overall it's an enjoyable experience, I like that there's no unlocking garbage and it's just a straight shooter. As I play more levels I'll definitely share my thoughts!