Well, let's see...
No freebie spotting of "CRYPT"-- that has to be earned with tombstone hits.
The captive ball scoring could be re-worked--way too little reward for how difficult it is to hit that five times. I suggested to MezelMods that he design a new toy for this area (skull pile, skeleton head, etc.), we'll see what Tim comes up with...if you like this idea drop him a PM!
The right ramp could use some tuning--it should keep building modes into the next ball like the left ramp does. It is almost impossible to complete all four modes on one ball as the ramp shot is so tight it has to be almost perfect.
I'd like to see the skill shot tweaked a little. It would be cool to have the drop targeting speeded up after each time you successfully hit the correct drop target (sort of like T-2) to make it more challenging. Perhaps three skill shot hits in a row on could also start a CJ mode to speed that along and make it more attainable. Be nice to have some other way to get CJ modes going--Crypt Jam is way too difficult to achieve for the average to even better-than-average player.
I'd like to see another 6 ball multiball mode worked into the game. Electric Chair M-Ball is way too much fun, let's do it more often!
There are some cool callouts and music that only pop up occasionally. I'd like to use them all, lighten up on a few Keeper cackles and "who goes there" and some other overly repetitious calls/sounds. I love the "Death March" tune, but I think it only pops up for a death save--let's use it for a SDTM drain! The biggest knock on this game from non-fans is the Keeper Cackle. Easy fix--mix in and make use of some of the less used callouts on the ramp shots.
The flashing lighting could be a lot better controlled and be more dynamic--way too much flashing going on in the back box and on the playfield--almost blinding at times (I know nothing of programing--I'm guessing the lights are controlled by code).
I'm sure I am missing more--this is just off the top of my head. Don't get me wrong, the code as it stands is very good---but it could be tweaked and tuned to make this game just that much better and attract a new group of fans. Sure would open up some eyes to the fact that DE made some really good games--just like the new code for SW did.