Oh,I've seen that before... You start off as a small particle and catch other little particles avoiding the enemy till your the size in the presented image.. Is it the same flash game your talking about? If it is I can lookup the name from a friend for you!!
It's called flow, it's a flash game on pc or it's a paid game on ps3.
You can play it here http://www.xgenstudios.com/play/flow or watch the video to verify
My Computer
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Windows 7 Ultimate x64 SP1
CPU
Intel Q6600 @ 2.6Ghz
Motherboard
Evga NF78-CK-132-A 3-Way SLI
Memory
4Gb DDR2 Corsair Dominator @ 800Mhz 5-5-5-15
Graphics Card(s)
EVGA 560 GTX SC FTW 1GB
Sound Card
Realtek HD 7.1 Audio, Plantronics GameCom780 7.1 Headset
Monitor(s) Displays
Dell S2409W
Screen Resolution
1920 x 1080
Hard Drives
SanDisk SDSSDHII-120G-G25 120GB SSD
Samsung 7200RPM 750Gb SATA
Samsung 850 EVO 120GB SSD
Western Digital Green 1TB 7200RPM
PSU
Xigmatek 750W Quad sli quad core 80% eff
Case
Antec 900 Gaming Case
Cooling
Zalman CNPS9700-NT NVIDIA Tritium
Keyboard
Logitech generic keyboard, MS wireless keyboard
Mouse
Razor Lachesis Banshee V2 Blue, 4000DPI, MS wireless mouse
Internet Speed
152Mb Virgin Media Fibre Optic
Antivirus
Microsoft Security Essentials
Browser
Google Chrome
Other Info
Wireless Gaming Receiver for Windows, Wireless Xbox 360 Pad
Onboard Realtek or Nvidia High Definition Audio (HDMI)
Monitor(s) Displays
Samsung JS7000 50" SUHD TV or Samsung 27" FHD 60Hz 8ms GTG V
Screen Resolution
1920 x 1080
Hard Drives
1 x Samsung 870 EVO 250 GB SSD (Windows 10 Pro), 1 x Samsung 850 EVO 250 GB SSD (Windows 10 Pro)
PSU
Corsair AX860 - 860W Modular Power Supply
Case
Phanteks Enthoo Luxe Full Tower Case - Black
Cooling
CORSAIR Hydro Series H150i PRO RGB 360mm Liquid CPU Cooler
Keyboard
Logitech K830 Illuminated Living-Room Keyboard
Mouse
Logitech MX Anywhere 2S Wireless Mouse
Internet Speed
100 Mbps
Antivirus
ESET Internet Security
Browser
Latest Version Of Firefox & Microsoft Edge Chromium Stable
Other Info
LG Super Multi Blue Internal Blu-ray Disk Rewriter - BH10LS30
6x2 HDMI Switcher (6 inputs, 2 outputs) so I can send the output of my Cable Box, Roku, or any my 4 computers to either my TV or Monitor separately or simultaneously.