Hi, just offering my two cents: for one, the "Kaboom!" guy could be done a little more over the top I think, especially the "Kaboom!" specifically, though I like the laugh. I may be wrong, but the "Sticky fingers" guy seems to be in battle but doesn't sound like it. If that's the case, try saying the lines more dynamically, like shouting the "Take this! Sticky fingers!" and having more distinct inflections. The transitions could be a bit smoother because some characters just fade out mid-sentence.
I can say I really like the "Delta" and "My place really was here" characters, I think your voice is great for those serious, Solid Snake-esque characters, lol. Also, the "Open wiiiiide" guy sounds pretty creepy, the rasp helps sell it for me, so good job! Just be careful about raspy voices because those can hurt your throat if you ain't careful. Hope this all helps!