Awesome idea, and justifies the creation of an altcoin... but
Awful parameter selection:
- scrypt is a proven failure.
- There is no demonstrable benefit to faster blocks.
- There is no clear standard for a "Mars minute" with which to define block time in (I'd question if this unit even should be defined).
- Difficulty retarget is probably too fast and will allow luck to influence difficulty a lot.
- Why change total coin supply?
Additionally, it would really make sense to try to address the shortcomings of Bitcoin with known solutions, in any new altcoin.
I don't see any evidence of that here..

The devs are pretty active on IRC @freenode #MRS and #Marscoin, they would probably love to hear from you. It's an international team, I am pretty sure they might be interested in feedback/help.
The faster blocks make sense though if you want to protect yourself from Earth miners (see discussion in their forum under "Evil Earth Miner Scenario". The retargeting is similar to 540 block coins, like Terracoin.
Regarding the coin supply: it aligns with the departure of the Marscoin blockchain to Mars:
2014 50 coins
2016 25 coins
2018 12 coins
2020 6 coins
2022 3 coins
2024 1 coin