Yes...I went through the beginning level and found all 28 mudokons.
- Secret 1: RIP15C01--3 Muds
- Secret 2: RIP15C03--2 Muds
- Regular Mud: RIP15C03--1 Mud
- Regular Mud: RIP15C05--1 Mud
- Secret 3: RIP15C04--2 Muds
- Secret 4: RIP15C06--1 Mud
- Regular Mud: RIP16C01--1 Mud
- Regular Mud: RIP16C04--1 Mud
- Secret 5: RIP16C03--3 Muds
- Regular Mud: RIP16C07--1 Mud
- Regular Mud: RIP18C10--1 Mud
- Regular Mud: RIP18C10--1 Mud
- Shadow Mud: RIP18C11--1 Mud
- Regular Muds: RIP18C05--2 Muds
- Shadow Mud: RIP18C06--1 Mud
- Regular Mud: RIP18C06--1 Mud
- Regular Muds: RIP18C07--2 Muds
- Secret 6: RIP20C03--3 Muds
Total: 28
I think the secret you're missing is the one screen with the sign telling you that leaving before saving all the mudokons will kill them. Secret 6. You need to blow up the sleeping slig...go to the top of the pulley and hop to where the sleeping slig used to be. Then roll into the secret.
I have all the screen numbers where the secrets can be located. Just refer to those and you'll find everything you need.
-oddguy