I love KTNE, also love this idea. I played your game once solo on hard mode with 1 minute left.
General:
1. the manual is hard to read. The setup could use some reordering.
2. the fontsize is quite big.
3. The lack of cards makes it repetitive. have you thought of just making the wires and symbols and parts of bombID be tokens you randomly place in the bomb.
4. the game lacks any checks, so how so you know if you actually cut the correct wire.
5. the centered text is a pain to my eyes. please just left align.
Modules:
Simon says: Maybe make it so the orientation of the card has in influence on the color you need to press, to have more communication between the players. And maybe reorder the if statements in the manual for '1st press', '2nd press', ..., because now its just one read down.
Roman numerals: I got confused, the numbers on the cards go only op to 6, (like the d6) but are also a 1to1 mapping. So the defuser just puts on the dice corresponding with the numeral and its done? if i understand correctly, you can fix this by making the numerals map to different numbers(the defuser doesn't know), that maybe also change based on the bombID. with that change it's actually a very good module, since it takes the defuser actual time to flip the d6 to correct number
Wires: this module is good (general advice about the tokens) with random wires there would be many more combinations.
Button: also good (can also use tokens for the word for more variation)
Symbols: with 13 symbols and choose 4, you have 17160 permutations or 715 combinations instead of the 5 cards, so also greatly benefits from having individual symbol tokens
Conclusion:
The game can be fun, but the moduleswill need more dynamics to be replayed (i suggest thing to put on the cards like token). The manual needs some clarification/restructure. The game still however suffers from not having any way to know whether you actually did it correct (which i don't know how to solve).
Thank you for making it it can definitely become a nice pnp game with some more work.